AWWA ABC Water Distribution Grades 1 & 2 Questions With 100% Correct Answers.

Which agency sets legal limits on the concentration levels of harmful contaminants in potable water distributed to customers? - Answer-US Environmental Protection Agency The number of monthly distributions system bacteriologiacal samples required is - Answer-Based on the population served What is the maximum contaminant level for total trihalomethanes (TTHM) in the united States? - Answer-0.080 mg/L Under the Surface Water Treatment Rule, disinfection residuals must be collected at the same location in the distribution system as - Answer-coliform samples Iron can cause "red water" and thus customer complaints when its concentration is above its secondary maximum contaminant level of - Answer-0.30 mg/L The goal of the Surface Drinking Water Act is for each ________ to accept primary enforcement responsibility (primacy) for the operation of the state's drinking water program. - Answer-State What is the objective of Total Coliform Rule? - Answer-To promote routine surveillance of distribution system water quality to search for fecal matter and/or disease-causing bacteria Which agency sets standards on the concentration levels of harmful contaminants in drinking water? - Answer-EPA Explain the difference between the different tiers of violations. Which tier is the most serious? - AnswerTier 1 = 24 hours (most severe) Tier 2= 30 days Tier 3= 1 yearA positive E. Coli test must be reported to the primacy health agency within what time period? - Answer- 24 hours How is the required number of monthly bacteriological samples determined? - Answer-Population served What is the action level for lead in first-draw samples taken from customer taps? - Answer-0.015 mg/L A water system is designated a community public water system if it serves how many homes? - Answer- 15 or more What authority provides specific water sampling instructions? - Answer-The state primacy agency According to the Lead and Copper Rule, what is the action level for lead? - Answer-0.015 mg/L Head is measured in - Answer-Feet A plat is - Answer-a map At which time of the day is the age of the water stored in the distribution system the highest? - AnswerEarly morning Water mains should primarily be sized based on - Answer-adequate fire flow at an appropriate pressure The most desirable residential pressure ranges from - Answer-50 to 75 psi (345 to 517kPa) Domestic water use includes water that is supplied to residential areas, ____________, and institutional facilities. - Answer-commercial districtsRiparian doctrine is sometimes called the "rule of - Answer-reasonable sharing." During which season is water typically the highest? - Answer-summer Of the common types of distribution system, which type is considered least desirable? - Answer-Tree system The velocity of water is calculated as the quantity of water that flows through a pipe - Answer-divided by the cross-sectional area of pipe What is the term for water pressure in a main or in a container that is measured by a gauge? - AnswerGage pressure In hydraulics, how is head expressed? - Answer-ft-pounds per pound What is the term for pressure measured in terms of the height of water ( in meters or feet)? - AnswerHead What are three types of head? - Answer-Elevation head velocity head pressure head The highest degree of protection for the exterior of a coating steel pipe is - Answer-Cathodic protection The C value is a measure of a pipe wall's - Answer-roughness, which retards flow due to friction. Type of joint for ductile iron piping? - Answer-Push-on joint What is the term for a sudden repeated increase and decrease in pressure that continues until dissipated by friction losses? - Answer-Water HammerNot a type of joint generally used today for connecting DIP and fittings? - Answer-Riveted joint What measurement of a pipe's strength refers to its ability to withstand the pressure exerted on it after it has been buried in a trench? - Answer-External Load